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Extend EXPLAIN to support output in XML or JSON format.

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There are probably still some adjustments to be made in the details
of the output, but this gets the basic structure in place.

Robert Haas
This commit is contained in:
Tom Lane
2009-08-10 05:46:50 +00:00
parent 18894c401f
commit 9bd27b7c9e
12 changed files with 1153 additions and 364 deletions
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16
src/include/commands/explain.h
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@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994-5, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/commands/explain.h,v 1.40 2009/07/26 23:34:18 tgl Exp $
* $PostgreSQL: pgsql/src/include/commands/explain.h,v 1.41 2009/08/10 05:46:50 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -15,16 +15,26 @@
#include "executor/executor.h"
typedef enum ExplainFormat
{
EXPLAIN_FORMAT_TEXT,
EXPLAIN_FORMAT_XML,
EXPLAIN_FORMAT_JSON
} ExplainFormat;
typedef struct ExplainState
{
StringInfo str; /* output buffer */
/* options */
bool verbose; /* print plan targetlists */
bool verbose; /* be verbose */
bool analyze; /* print actual times */
bool costs; /* print costs */
ExplainFormat format; /* output format */
/* other states */
PlannedStmt *pstmt; /* top of plan */
List *rtable; /* range table */
int indent; /* current indentation level */
List *grouping_stack; /* format-specific grouping state */
} ExplainState;
/* Hook for plugins to get control in ExplainOneQuery() */
@ -54,4 +64,6 @@ extern void ExplainOnePlan(PlannedStmt *plannedstmt, ExplainState *es,
extern void ExplainPrintPlan(ExplainState *es, QueryDesc *queryDesc);
extern void ExplainSeparatePlans(ExplainState *es);
#endif /* EXPLAIN_H */